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I have needed to repeatedly spray down and attempt to "polish and re-spring" the slider switch contacts on the pushbutton deck. Access can be tricky too.
The EMUD 915 I worked on was just like this. The buttons were creating issues with audio, using all the tone/mono/stereo control permutations, including very flimsy tone pots.
First I hit it with DeOxit D5 then CRC 5-56 or contact cleaner leaving no residue, finally DeOxit one or two more times. Don't neglect the lubrication needed on the mechanism/slider. A Korting switch deck needed even more solvent-rinse-spray-repeat.
German designs are so similar across the makes yet parts quality varies. I felt the EMUD was more solidly built than Grundig and Korting.
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"When resistors increase in value, they're worthless"
-Dave G
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